Question about 1998 Honda VF 750 C Magna

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Engine only runs with choke on


my motorcycle was left for about 4 months with the fuel left in it. i drained all the bad fuel out of the system. i filled it up with supreme gasoline. i then attempted to start the bike. it will run with the choke on but will shut off as soon as you turn the choke off. the bike warms up but never idles up with the choke on. i removed the carbs and checked the floats and jets. i cleaned all of them (there really was no build up) and i also replaced the spark plugs. when i installed the carbs i still have the same problem. i did not completly dis-assemble the carbs i only removed the float and jet covers. any info on this would be greatly appreciated.

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  • jbarnett7580 Apr 13, 2009

    are there other jets besides the slow and main? i have cleaned all four of the slow and all four of the main and can see light through them.

  • jbarnett7580 Apr 14, 2009

    Thanks! will try when i return home.


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Dear honda 750 your problem is a pluged main jet you must completley disasseble the carbs and give them a good cleaning with carb cleaner and comp air visually check to make sure you can see light through the jets after cleaning. your choke system by passes the jets that is why it runs on the choke setting only. hope this helps jim

Posted on Apr 12, 2009

  • jim cob Apr 13, 2009

    dont forget to clean jet needle and needle jet slide located in the carb top and center. if all looks good i would check fuel filter and screen located in tank also make sure you have fuel at the carb by removing fuel line and turning on the petcock. jim


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Hello, my car has sat for about 8 months, 4 months into it, I started it up and once the engine warms up, the idle begins to fluctuate between 1100 and 2000 rpm, up and down up and down it does not do this...

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Didnt start the motorcycle for four months.will only run with the choke on.

The gas is probably bad after months of sitting.
Ideally, you would drain your tank and replace with good gas f you can.
New gas or not, purchase a can of "Seafoam" and add it to your will help clean out your fuel system.
Worst case scenario, you will need to clean your carburetor if everything above doesn;t work.

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Havent started my bike in 6 months all the lights work but wont start and yes it has gas

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Hi, if it's stood that long it may be that the fuel's gone off, had a lot that smells like dirty paint thinners after a couple of months & bikes don't want to run on it. I'd drain the carby & tank & try fresh fuel. May just be badly loaded up if fuel was left on etc, so maybe remove sparkplug & give a few good kicks to clear it out, then refit & try. hope this helps :)

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